Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add GoldenWing-360/claude-security-skills --skill dns-domain-securitygit clone --depth 1 https://github.com/GoldenWing-360/claude-security-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/goldenwing-360/claude-security-skills/dns-domain-security)<a href="https://agentmods.dev/skills/goldenwing-360/claude-security-skills/dns-domain-security"><img src="https://agentmods.dev/badge/skills/goldenwing-360/claude-security-skills/dns-domain-security/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/goldenwing-360/claude-security-skills/dns-domain-security"><img src="https://agentmods.dev/badge/skills/goldenwing-360/claude-security-skills/dns-domain-security.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00096 | $0.03561 |
| Opus 5 | $0.00048 | $0.01781 |
| Sonnet 5 | $0.00019 | $0.00712 |
| Haiku 4.5 | $0.00010 | $0.00356 |
Grade A, and why
dns-domain-security scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 12d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
code=$(curl -s -o /dev/null -w '%{http_code}' --max-time 10 "https://$name/") How it starts
The opening of the file, as written. The whole thing — 220 lines — stays where its author put it; the contents beside it link to each section on GitHub.
DNS & Domain Security
Everything above DNS assumes DNS is telling the truth. TLS certificates are issued based on DNS-validated control, email authentication lives in TXT records, and your entire brand hangs off a registrar login. Yet the DNS layer usually gets one setup session at launch and then years of unreviewed drift: records pointing at services that no longer exist, a registrar account with a password from 2019, and API tokens with zone-wide write access baked into three CI pipelines.
This skill audits and hardens that layer. The recurring theme is lifecycle: DNS records outlive the things they point to, and every orphaned pointer is a liability someone else can pick up.
When to invoke
- Periodic audit of a zone you operate (quarterly is a good cadence)
- A SaaS service, PaaS app, or static-hosting project was decommissioned — did its DNS records go with it?
- Domain or registrar account is changing hands (team member left, agency handover, acquisition)
- A certificate appeared in CT logs that nobody requested
- Setting up DNS automation (CI, ACME DNS-01, dynamic records) and deciding token scope
- A domain in the portfolio is approaching expiry
The threat map
| Layer | Attack | Primary control |
|---|---|---|
| Registrar account | Credential stuffing, social-engineered transfer | MFA (hardware key), transfer lock, registry lock |
| Domain lifecycle | Expiry → re-registration by attacker | Auto-renew, expiry monitoring, long registration |
| Zone content | Dangling CNAME → subdomain takeover | Stale-record audits, deprovision checklist |
| Certificate issuance | Unauthorized cert from any public CA | CAA records, CT-log monitoring |
| Resolution integrity | Cache poisoning, spoofed responses | DNSSEC (with operational care) |
| Provider API | Leaked token rewrites the zone | Per-zone scoped tokens, rotation |
Registrar compromise sits above everything: an attacker who controls the registrar account controls NS delegation, and from there every record, every cert, every mailbox. Harden top-down.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 12d ago First seen · 220 lines · 96 tokens per session scan A 0db62e675fc5
dns-domain-security is a skill published in the GitHub repository GoldenWing-360/claude-security-skills (17 stars, last pushed 1mo ago), licensed MIT. It adds 96 tokens to every session and 3,561 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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